How to stop endless EJB 3 timer?

Question

I am new to EJB 3 . I use the following code to start endless EJB 3 timer then deploying it on JBOSS 4.2.3

@Stateless
public class SimpleBean  implements SimpleBeanRemote,TimerService  {

@Resource
TimerService timerService;
private Timer timer ;
@Timeout
public void timeout(Timer timer) {
    System.out.println("Hello EJB");

 }
}

then calling it

  timer = timerService.createTimer(10,  5000, null);

It works well. I created a client class that calls a method that creates the timer and a method that is called when the timer times out.

I forget to call cancel then it does not stop .redeploy with cancel call never stop it. restart Jboss 4.2.3 never stop it. How I can stop EJB timer ? Thanks for helping.

score 29 · Accepted Answer · answered Apr 22 '10 at 10:26

29

    public void stop(String timerName) {
    for(Object obj : timerService.getTimers()) {
        Timer t = (Timer)obj;
        if (t.getInfo().equals(timerName)) {
        t.cancel();
        }
    }
}

answered Apr 22 '10 at 10:26

Davide Consonni

2,094
26
27

2

After three years, Thanks A lot :) – mebada Sep 02 '13 at 07:54
This cancels all the timers, but if you consult the "getTimers()" they still there :/ – jmlv21104 Mar 14 '14 at 14:32
No! This will cancel only the timers that have the same name as `timerName`. – Andrey Luiz Jan 21 '15 at 16:45

score 3 · Answer 2 · answered Oct 03 '12 at 20:55

I had the same problem, with my JBoss AS 6.1.
After killing this endless (persistent) timers I found the following solution for AVOIDING this problem in the future:
With JBoss AS 6.1 (EJB 3.1) it is possible to create non-persistent automatic timers, they DO NOT SURVIVE a server restart:

@Schedule(minute=”*/10”, hour=”*”, persistent=false)
public void automaticTimeout () {

score 2 · Answer 3 · answered Dec 24 '14 at 09:27

Another method is to creat ethe automatic timer (@Schedule) with the 'info' attribute and then check in the timer service for timers with the same info and if available cancel it:

@Schedule(hour="*", minute="*",second="3", persistent=false,info="AUTO_TIMER_0")
void automaticTimeOut(){

    if(timerCount==0){System.out.println("FROM AUTOMATIC TIME OUT -----------------> CALLED");timerCount++;}
    else{

        Iterator<Timer> timerIterator=timerService.getTimers().iterator();

        Timer timerToCancel=null;
        while(timerIterator.hasNext()){

            Timer tmpTimer=timerIterator.next();
            if(tmpTimer.getInfo().equals("AUTO_TIMER_0")){timerToCancel=tmpTimer;break;}

        }//while closing

        if(timerToCancel!=null){

            timerToCancel.cancel();
            System.out.println("AUTOMATIC TIMER HAS BEEN CANCELED ----------------->>>>");

        }//if closing

    }//else closing

}//automaticTimeOut closing

score 2 · Answer 4 · answered Mar 29 '12 at 01:11

2

You can also undeploy your application, this will "kill" all timers.

answered Mar 29 '12 at 01:11

Steve

445
1
8
18

2

Not likely if the timers are persistent – JJCV Jun 13 '19 at 13:56

score 1 · Answer 5 · answered Mar 22 '17 at 07:08

1

Since EJB 3.1, there are new methods on TimerService which take a TimerConfig instead of a Serializable payload. Using TimerConfig allows to make the Timer non-persistent.

timerService.createIntervalTimer(10, 5000, new TimerConfig(null, false));

answered Mar 22 '17 at 07:08

Xavier Dury

1,530
1
16
23

score 0 · Answer 6 · edited Jan 21 '16 at 22:29

0

Try the @PreDestroy annotation within the bean where you want to close.

For example:

@PreDestroy
private void undeployTimer() {
 //..
}

Generally the resource de-allocation is done here.

edited Jan 21 '16 at 22:29

Onato

9,916
5
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54

answered Jan 21 '16 at 22:03

Varada Pujari

1

How to stop endless EJB 3 timer?

6 Answers6

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